Diagram showing bonnet movement measurements in thousandths of an inch under chassis twist conditions for various engine mounting configurations.
| Identifier | ExFiles\Box 14\5\ Scan219 | |
| Date | 18th June 1931 guessed | |
| BONNET MOVEMENT IN .001 INS NEW SIDE FRONT & OFF SIDE REAR ROAD WHEELS RAISED 3" FROM THE GROUND FIG. I P II 4 ENGINE FEET SOLID RAD. DASH BONNET RADIATOR O.S. | N.S -2 | +8 -15 | +12 +2 | 0 +10 | -12 FIG. II P II DIAMOND MOUNTING SOLID RAD. -38 | +56 -46 | +76 +39 | -24 +42 | -75 FIG. III P I SOLID REAR ENGINE FEET SHEET ALUM DASH ISOLATED SCUTTLE -65 | +47 -73 | +13 +43 | -29 +76 | -12 FIG. IV P II DIAMOND MOUNTING CENTRAL MOUNTED RAD. 2 STAY TUBES. +1 | -2 +1 | -1 0 | -4 0 | -4 | ||
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).